Casa Verde Tours transportation to Antigua is only Q40 (others charge Q60) right now. Q90 to the capital. They also have the best shuttle to the Semuc Champey area, a 5 AM departure that arrives in Lanquin at 4 PM.
The Casa Verde shuttles depart from in front of Alegre Pub in the zone viva for Antigua, the capital and Lanquin at 5 AM and 8 AM.